Craig Landers uses a snowblower to clear the sidewalks outside of Ralph J. Bunche Elementary and Middle School on Macomb in Detroit on Friday January 3, 2014. Ryan Garza / Detroit Free Press

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Winter survival items and food staples are flying off store shelves, road crews are plowing and salting and gas stations are doing brisk business as metro Detroiters brace for another major snowstorm in a winter that's already well above average for snowfall.

Even as residents continue grappling with more than 11 inches of snow from earlier in the week, up to another foot of snow could drop by Sunday night. That will be followed by brutally cold air and wind chills that meteorologists have said could reach 20 to 40 degrees below zero. ...